Depth of Field - While a lens focuses on a single plane of depth, there is usually an additional area in focus behind and in front of that plane. This is depth of field. Depth of field increases as the iris is closed.. Used . There is more depth of field the wider the lens and le . Used . ...

Ohm - A unit of measurement for the electrical resistance equal to that of a conductor in which a current of one ampere is produced by a potential of one volt across its terminals. One ohm is the resistanc. Used . e in a circuit when one volt maintains a current of one amp. The unit, originally ohma or ohmad, was first used by Charles Tilston Bright and Latimer Clark in 1861 and is still in use today.. Used . ...

Lighting instruments - There are a variety of instruments frequently used in the theater. Although they vary in many ways they all have the following four basic components in one form or another...

* Box/Housin. Used . g - a metal or plastic container to house the whole instrument and prevent light from spilling in un-wanted directions.
* Source of light (bulb or lamp).
* Lens or opening - the g. Used . ap in the housing where the light is intended to come out.
* Reflector - behind or around the light source in such a way as to direct more light towards the lense or opening.

Additional feat...

Amp Racks - An amp rack is any furniture, fixture, or case where multiple amplifiers are mounted in slots or grooves, generally used in touring systems because they are easy to transport.

. Used . . Used . ...

Volt - A unit in the international system representing the electric potential and electromotive force equal to the difference of electric potential between two points on a conducting wire carrying a constant. Used . current of one ampere when the power dissipated between the points is one watt. Named after Alessandro Volta for his work with batteries, the term was adopted in the 1880s and is still in u. Used . se today....

Crank Lifts

Crank lifts will prevent injuries and enable stage crews to easily move heavy items with ease. A crank up lift can typically be used to lift up anywhere from 100 LBs to 500 LBs of materials. Every crank lift has different adjustable heights that they can lift. Most cranks lifts are able to lift objects at least 13 feet. Some can go as high as 20 feet.
Most crank lifts are different than a regular conventional lighting lift because they are more mobile and take less time to set up. In only takes a few minutes for one person to set up or take apart several crank lifts. Other features of a crank lift stand are that they have collapsible legs, built in wheels so that they can be easily moved and they have a multiple locking mechanisms for safety reasons. The locks will keep the crank lift in place and prevent it from sliding or moving even an inch.
A truss crank lift is a type of crank lift, which can also be used to load up and unload heavy items. They are extremely stable and wonâ??t be easily knocked down by clumsy passer-byers that bump into it. Crank lifts usually come with state of the art heavy-duty steel cables that have been readily tested and proven to hold up.
Make sure to use crank lifts that are compatible with other truss systems.